The temporary modifier for the zoom mode when we're panning and scanning causes issues on Linux. It causes the window to move. This patch changes the modifier key to be ctrl for non-Mac and cmd for Mac.
The temporary modifier for the zoom mode when we're panning and scanning causes issues on Linux. It causes the window to move. This patch changes the modifier key to be ctrl for non-Mac and cmd for Mac.

R=dsinclair@chromium.org

Review URL: https://codereview.appspot.com/11515043
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